| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Puzzles on Cypercrime and God's Mathematics | 978-1-7059-5135-4 (1-7059-5135-X) | 2019 | |
| Rigorous Proofs for Riemann Hypothesis, Polignac's and Twin Prime Conjectures in 2020 | 978-1-6609-0576-8 (1-6609-0576-1) | 2020 | Prof Bernhard (Pseudonym) Riemann |